... 2.light and high strength 3.Easy installation,low cost steel roof tile Pressure plate in the 1930s in the United States in the ... site - divided into the roof, wall panels, floor boards and ceiling panels. The use of color steel plate for wall decoration board, ... lap, high-wave plate galvanized sheet with floor cover; lap of the low-wave plate is preferable to make wall board. 2012 steel roof tile